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  <title>Hamming distance</title>
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  <div id="layout-content"><div id="function.gmp-hamdist" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">gmp_hamdist</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gmp_hamdist</span> &mdash; <span class="dc-title">Hamming distance</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.gmp-hamdist-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>gmp_hamdist</strong></span>
    ( <span class="methodparam"><span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span> <code class="parameter">$a</code></span>
   , <span class="methodparam"><span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span> <code class="parameter">$b</code></span>
   ) : <span class="type">int</span></div>

  <p class="para rdfs-comment">
   Returns the hamming distance between <code class="parameter">a</code> and
   <code class="parameter">b</code>. Both operands should be non-negative.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.gmp-hamdist-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">a</code></dt>

     <dd>

      <p class="para">可以是一个 GMP
数据 <span class="type"><span class="type resouce">resouce</span></span>，或一个可以转换为数值的字符串。</p> 
      <p class="para">
       It should be positive.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">b</code></dt>

     <dd>

      <p class="para">可以是一个 GMP
数据 <span class="type"><span class="type resouce">resouce</span></span>，或一个可以转换为数值的字符串。</p> 
      <p class="para">
       It should be positive.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.gmp-hamdist-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   GMP 数值<span class="type"><span class="type 资源">资源</span></span>.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.gmp-hamdist-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4076">
    <p><strong>Example #1 <span class="function"><strong>gmp_hamdist()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$ham1&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_init</span><span style="color: #007700">(</span><span style="color: #DD0000">"1001010011"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$ham2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_init</span><span style="color: #007700">(</span><span style="color: #DD0000">"1011111100"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">gmp_hamdist</span><span style="color: #007700">(</span><span style="color: #0000BB">$ham1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$ham2</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/*&nbsp;hamdist&nbsp;is&nbsp;equivalent&nbsp;to:&nbsp;*/<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">gmp_popcount</span><span style="color: #007700">(</span><span style="color: #0000BB">gmp_xor</span><span style="color: #007700">(</span><span style="color: #0000BB">$ham1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$ham2</span><span style="color: #007700">))&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
6
6
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.gmp-hamdist-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="gmp_popcount.html" class="function" rel="rdfs-seeAlso">gmp_popcount()</a> - Population count</span></li>
    <li class="member"><span class="function"><a href="gmp_xor.html" class="function" rel="rdfs-seeAlso">gmp_xor()</a> - Bitwise XOR</span></li>
   </ul>
  </p>
 </div>


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